Networking Problems

I have a Hitachi "47" drive flashed with Maximus-Garyopa_XTRM-HITACHI_v2_3_Stealth_Rev2, I did the "Two wire trick" to get the 360 in mode "b", putting the pins in the "0" and "9" spots. I used this guide. The problem is that a friend and I tried to play PGR 3 with system link and could not play. When you search for a game it says "there are no games found" Anyone else had this problem??